Date: Wed, 16 May 2012 12:41:33 +0200
From: Anisse Astier <anisse@astier.eu>
To: Larry Finger <Larry.Finger@lwfinger.net>
Cc: linux-wireless@vger.kernel.org
Subject: Re: rtl8192ce : freeze after connecting to network with FW Power
 Save on
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On Tue, 15 May 2012 11:45:40 -0500, Larry Finger <Larry.Finger@lwfinger.net> wrote :

> On 05/15/2012 10:04 AM, Anisse Astier wrote:
> > On Tue, 15 May 2012 09:51:23 -0500, Larry Finger<Larry.Finger@lwfinger.net>  wrote :
> >
> > I'll try wireless-testing then. Are all rtlwifi patches in
> > wireless-testing ?
> 
> I think that all are in wireless-testing.

Ok, problem is reproduced with wireless-testing, too. I also have hangs
when unloading the driver sometimes (loaded with fwlps=0), but I wasn't
able to get a trace either.

> 
> > (This problem was also reproduced with 3.2.X)
> >
> >
> >> to say that I cannot duplicate your results, and that we need to explore the
> >> rest of your system to see what is different.
> >>
> >> Is your system 32- or 64-bit? How many cores in your CPU? Have you tried
> > 32 bits, SoC is an AMD E1-1200, with 2 cores.
> 
> My search shows that the clock rate for this processor is 1.4 GHz. The only 
> system that I have that can run the RTL8188CE is 2 GHz.
> 
> >> connecting to more than one AP? What is the make and model of the AP that needs
> > I've tried two different APs, with and without keys (open and WPA2)
> >
> >> to have power save turned off? What is the mode of operation?
> > One is a Linksys WRT54GL with dd-wrt(WPA2), the other(Open) is a
> > carrier's set top box/router (Freebox).
> 
> I thought the locking in the Power Save routines was OK, but perhaps there is 
> some raciness that is exposed by the difference in speeds. The lack of 
> diagnostics on the netconsole is a problem.
> 
> Do you have kernel debugging turned on for the lock diagnostics, and the Detect 
> Hung Task configuration variable? Perhaps we can get some logging that way.
I enabled the following options:
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_LOCKDEP=y
CONFIG_DEBUG_LOCKDEP=y
CONFIG_DEBUG_SPINLOCK=y
CONFIG_DEBUG_MUTEXES=y
But it didn't detect any lockup yet, and machine still hangs. I'll try
CONFIG_PROVE_LOCKING.

Enabling CONFIG_DEBUG_INFO seems to make the problem go away...


> 
> Have you tried the vendor's driver from www.realtek.com? I don't think it will 
> make a difference, but it could be worth a try.
Nope, not yet.


> 
> Larry